Multi-system Connective Tissue Disease Flashcards
What is Systemic Lupus Erythematosus?
SLE
Multi system autoimmune inflammatory disease in which autoantibodies to a variety of autoantigens result in the formation and deposition of immune complexes.
Which are the systems which are affected in SLE and what are the constitutional symptoms?
Systems affected:
- CNS
- Heart
- Lung
- Renal
- MSK
- Skin
Constitutional symptoms:
- Fatigue
- Weight loss
- Fever
- Myalgia
Outline the specific systems based symptoms of SLE?
Skin:
- Malar photosensitive rash sparing the nasolabial folds
- Discoid erythematous rash (chest and face)
MSK:
- Arthritis usually involves peripheral joints
- Often migratory may affect joints for a short period of time before affecting another joint
- Deforming arthropathy (Jaccoud’s)
Renal:
- Proteinuria/ GN
- Increased BP
Cardiac:
- Pericarditis, valve disease, athersclerosis
Respiratory:
- Pneumonitis, pul fibrosis, pleural effusions
CNS:
- Seizures
- Psychosis
- depression
Haematological:
- Low WCC
- Low Platelets
- anaemia
- May have Autoimmune haemolytic anaemia
Which autoantibodies are associated with SLE and which is most associated?
ANA +ve in 95% of patients with SLE (sensitive)
dsDNA (very specific for SLE) but only present 60% of the time (associated with poor prognosis)
Anti ENA’s (extranuclear antibodies) 30% of patients
- Sm (only SLE)
- Ro*
- La*
- RNP*
*Often present in SLE but also in other connective tissue disorders such as Sjogren’s
Outline the investigations of a patient with suspected SLE?
Routine bloods and urinalysis.
- U+E, FBC, ESR (raised), CRP
Immunological bloods:
- ANA autoantibodies
- dsDNA antibodies
- Anti ENA (Ro, La, SM, RNP)
- Anticardiolipin antibodies (false +ve syphylis serology)
Imaging:
- CXR/CT if respiratory symptoms (may see fibrosis)
- MRI head if neuro symptoms
Invasive:
- Renal biopsy may be indicated in the presence of renal symptoms.
Outline a classical history of a patient presenting with SLE which would warrant further investigation?
Fever, joint pain and a rash in a women of child bearing age.
Using the mnemonic SOAPBRAIN describe the features of SLE?
- Serositis (inflammation of membranous linings)
- Oral ulcers
- Arthritis
- Photosensitivity
- Blood disorders
- Renal involvement
- Antinuclear antibodies (ANA)
- Immunologic phenomena (eg, dsDNA; anti-Smith [Sm] antibodies)
- Neurologic disorder
- Malar rash
- Discoid rash
Describe the management of SLE?
Simple disease:
- NSAIDs
- Lifestyle measures are used (avoid the sun use sun screen)
Disease modifying drugs in moderate disease:
- Hydroxychloroquine is often used.
- Corticosteroids can be used in short doses or severe disease.
- Azathioprine can be used as a steroid sparing agent
Severe disease:
- Cyclophosphamide (chemo agent can be used)
- Methotrexate
- Ciclosporin
What is antiphospholipid syndrome?
It is a condition in which the presence of antiphospholipids (anti-cardiolipin and lupus anticoagulant) cause a predispostion to clotting
Paradoxically this is due to a disruption in the clotting cascade so despite the predisposition to clotting patients have a prolonged APTT.
Describe the different aetiology of antiphospholipid syndrome?
It can either be a primary autoimmune disorder; 70% of cases.
Or can be secondary to SLE; 30% of cases
How do patients with anti-phospholipid syndrome present?
What other symptoms may a patient with APL have?
Most commonly presents in women who have had recurrent miscarriage.
May present with venous or arterial clots.
May also have livedo reticularis, thrombocytopenia, migraines, epilepsy, leg ulcers, haemolytic anaemia, heart valve disease, renal impairment
Describe the treatment of antiphospholipid syndrome?
It is managed with low dose aspirin, often prevents miscarriage.
Lifestyle advice e.g. avoid prolonged immobilisation
If recurrent clots venous anticoagulation is needed: warfarin target INR 3.5 or a DOAC (lifelong)
If pregnant given LMWH and aspirin, early delivery preferred.
Describe the clinical features of limited systemic sclerosis?
CREST Syndrome
- Calcinosis
- Raynauds
- Esophageal dysmotility
- Sclerodactyly
- Telangiectasia
Skin involvement is limited to the elbow
Patients will not be able to open there mouth very wide (microstomia)
Describe the clinical features of diffuse systemic sclerosis?
Diffuse skin involvement and organ fibrosis
Cardiac: arrhythmias, myocardial fibrosis, pericarditis, myocarditis, valve problems
Lung: fibrosis and pulmonary hypertension
GI: GORD, aspiration, dysphagia, anal incontinence, dysmotility, constipation, malabsorbtion
Renal: acute hypertensive crisis (commonest cause of death)
- Which autoantibody is present in limited system sclerosis?
- Which are present in diffuse?
- Anti-centromere antibody (ACA)
2.
Anti-topoisomerase 1 (particularly in lung fibrosis)
Anti-RNA polymerase III (particularly in renal involvement)
Anti-sd-70
